The grass genera of the world
Habit, vegetative morphology. Perennial; caespitose. Culms herbaceous. Leaves non-auriculate. Leaf blades narrow; setaceous; without cross venation. Ligule an unfringed membrane; truncate; 0.5–1 mm long.
Reproductive organization. Plants bisexual, all with bisexual spikelets; with hermaphrodite florets.
Inflorescence. Inflorescence paniculate; contracted; espatheate; not comprising partial inflorescences and foliar organs. Spikelet-bearing axes persistent. Spikelets not secund; pedicellate.
Female-fertile spikelets. Spikelets 10–12 mm long; compressed laterally to not noticeably compressed; disarticulating above the glumes. Rachilla prolonged beyond the uppermost female-fertile floret; the rachilla extension naked. Hairy callus present.
Glumes two; more or less equal; long relative to the adjacent lemmas (exceeding them); pointed (acute); awnless; carinate; similar. Lower glume 5(–6) nerved. Upper glume (4–)5 nerved. Spikelets with female-fertile florets only.
Female-fertile florets 1. Lemmas similar in texture to the glumes (firm); not becoming indurated; incised (deeply notched); awned. Awns 1; median; from a sinus; geniculate; entered by one vein. Lemmas hairy; non-carinate; without a germination flap; 5 nerved. Palea present; relatively long; 2-nerved. Lodicules present; 2; free; membranous; glabrous; not toothed; not or scarcely vascularized. Stamens 3. Ovary apically glabrous. Styles free to their bases. Stigmas 3.
Classification. Watson & Dallwitz (1994): Pooideae; Poodae; Aveneae. Soreng et al. (2015): Pooideae; Phaenospermateae. 1 species (S. trigyna).
Distribution, phytogeography, ecology. China.
Special comments. Fruit data wanting. Anatomical data wanting.
We advise against extracting comparative information from the descriptions. This is much more easily achieved using the DELTA data files or the interactive key, which allows access to the character list, illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, distributions of character states within any set of taxa, geographical distribution, and classifications. See also Guidelines for using data taken from Web publications.
Cite this publication as: ‘Watson, L., Macfarlane, T.D., and Dallwitz, M.J. 1992 onwards. The grass genera of the world: descriptions, illustrations, identification, and information retrieval; including synonyms, morphology, anatomy, physiology, phytochemistry, cytology, classification, pathogens, world and local distribution, and references. Version: 11th December 2017. delta-intkey.com/grass’.